Stereophotography



g- 1939- G. WILMANNS ET AL ,1

STEREOPHOTOGRAPHY Filed Oct. 20, 1936 Fig: 1 I orthochromateadgy sensitized emulsion wth} coder former for 'fed,

. yeadow filter log er I I panchromatcadg sensitized emudadon wet/2, color-former \fiuppart for yreen O fi u go Z orthoozzromatcadgy .senu'tized ebnudsz'on with, c0607 former for red and We'M 3 9880 fitter egg e ,pcznc/aromade'cag/ I 6enaa'z'ed emudaejon with coder former for green supper?) Gustav We'dmaanns We'dhedm Schneider Qvweutow Patented Aug. 1, 1939 units!) STATES STEREOPHOTOGRAPHY Gustav Wilmanns, Walton,-

Schneider, De'seau,

mcsne assignments. Asia. tion, Binghamton, N.

aware Application Claims.

Our present invention relates to the manuiacture of stereophotographic pictures and more particularly to the manufacture of stereoscopic pictures in the manner of anaglyphs.

Processes are .known in which by simple manipulation anaglyphic stereoscopic pictures are produced which. can be projectedwithout the necessity of using special optical devices in consequence of the arrangement of the two component pictures. In one such process two component pictures are produced each through a complementary filter, for instance one. through a red filter. andthe other through a green filter, the -two exposure objectives .being placed at such a distance.apart that. they produce stereoscopic component pictures. The optical arrangement is in this case such that the two component pictures are projected. on to the exposure material not side by side, butsuperimposed. As an exposure material there is used a plate or film on one side of which there is an emulsion layer sensitized orthochromaticallyand on the other side a panchromatic layer. Between these two layers there is a color filter. After development of. the two images in any manner the picture on one side is colored red and that on the other side complementary, that is to say, green. This process requires a whole series of troublesome individual baths and treatments.

This invention relates to the use of an exposure material having two layers directly superimposed which after exposure in the kno'wn manner through a green filter and through a red (minus green) filter contains on both layers stereoscopic component pictures superimposed in stereoscopic parallax. emulsion layers contain each one (or more) components which are substantive towards v.gelatin and are coupling components for red andgreen development spectrally or for the antidiazotate process as described in U. S. Patent 1,963,197. The two layers are either separated by a filter layer as shown in Fig. 1 of the accompanying drawing or the orthochromatically sensitized emulsion acting as the upper layer contains a corresponding filter dye-stufi with which it is difiusely colored as illustrated in Fig. 2. The lower emulsion layer is panchromatically sensitized.

The two superimposed silver halideorpora- Y., a corporation of Del- 1 October 20. 1936. Serial no. loosed In. Germany October 30, 1935 The coupling components which produce the color on development are so distributed that the lower layer becomes the green component-and the upper layer the red component.

when such a material has been developed with a suitable color developer there is obtained a twocolor negative the color values of which are complementary to those of the original. After removing the silver image from the color image,'for

instance, by the known use. of Farmers reducer,

this negative may be copied by projection or by contact on a material of like composition and may be developed in the same manner whereby there is obtained a positive corresponding ,with the original in color values after the silver has againbeen disslo'ved on the color image.

It is. possible, however, to arrive at a positive in correct color directly by reversal development.

After exposure the image is developed by an ordi nary developer in black and white and after known reversal at the second development to a ,color image by means of a color developer. In both ways there is obtained a two-color stereoscopic picture in which the stereoscopic efiect is visible by inspection with anaglyphic spectacles. Since the .two component pictures appear colored the film is a two-color film and shows assuch in addition to the stereoscopic eflect a colored reproduction of the "photographed object.

If the component pictures are to be produced bythe antidiazotate method then after the development the unchanged silver bromide is converted into a silver antidiazotate and this is coupled with the component in the layer on acidification as described in U. S. Patent 1,963,197.

- instance, described in German specification No.-

611,229. The upper emulsion of the two directly The following example illustrates the inven superimposed layers is dyed diffusely with a yellow dyestufi; the lower layer serving as the panchromatically sensitized layer contains for pro-. ducing the green image bis(l'-hydroxy-2-naphthoylamino) diphenyl corresponding with the following formula moo oonnOcocmc ounces.

to the amount of 4 grams each per litre of emulsion. The orthochromatically sensitized upper layer yielding thered image contains per kilo of emulsion 10 grams of 4:4'-diphenyldicarbonylamino-l-phenyl-3-methyl 5 pyrazolone corre-. sponding with the following formula and the aforesaid yellow filter color.

.The development to a colored picture is by diethylaminoaniline hydrochloride. There is produced either a complementary colored negative or correct color positive accordingly as this color developer is used in a simple development process or as a second developer in a reversal process.

When producing the stereoscopic picture according to the antidiazotate method the exposed material is developed and the unchanged silverbromide converted into silver antidiazotate, for instance, by means of a-naphthalene-sodiumantidiazotate which may be applied in a 1 per cent solution. The material is washed and then immersed ina solution of acetic acid of 2 per cent strength whereby the red and green partial stereoscopic pictures are produced. Then the material is again washed and the silver removed by Farmers reducer.

What we claim is:

1. A process of producing stereoscopic pictures which comprises incorporating in the upper layer of two silver halide gelatin emulsion layers arranged in super-imposition on a support a yellow filter dye and a coupling component having substantive character towards gelatin for the production of a red component picture, sensitizing this layer orthochromatically, incorporating in the lower layer a coupling component having substantive character towards gelatin for the production of a green component picture, sensitizing this layer panchromatically, exposing said material through a stereoscopic optical device adapted for the production of anaglyphs, and developing said material with a solution capable of forming complementary dyestufi pictures at the places of the silver picture by interaction with said coupling components.

2. A process of producing'stereoscopic pictures which comprises incorporating in the upperlayer of two silver halide gelatin emulsion layers arranged in superimposition on a support and separated by a yellow filter layer a coupling component having substantive character towards gel- .atin for the production of a red component picture, sensitizing this layer orthochromatically, incorporating-in the lower layer a coupling component having substantive character towards gelatin for the production of a green component picture,- sensitizing this layer panchromatically, ex-

posing said material through a stereoscopic opti- 2,1es,1es I cal device adapted for the production of anaglyphs, and developing said material with a solution capable of forming complementary dyestufi pictures at the places of the silver picture by interaction with said coupling components.

3. A process of producing stereoscopic pictures which comprises incorporating in the upper layer 'of two silver halide gelatin emulsion layers arranged in superimposition on a support a coupling component having substantive character towards gelatin for the production of the red component picture and a yellow filter dye, sensitizing this layer orthochromatically, incorporating in the lower layer a coupling component having substantive character towards gelatin for the production of a green component picture, sensitizing this layer panchromatically, exposing said material through a stereoscopic optical device adapted for the production of anaglyphs, and developing said material with a solution capable of forming complementary dyestufi pictures at the places of the silver picture byjnteraction with said coupling components.

4. A process of producing stereoscopic pictures which comprises incorporating in the upper layer of two silver halide gelatin emulsion layers arranged in superimposition on a support and separated by a yellow filter layer a coupling component having substantive character towards gelatin for the production of a red component picture, sensitizing this layer orthochromatically, incorporating in the lower layer a coupling component having substantive character towards gel- 1 atin for the production of a green component picture, sensitizing this layer panchromatically, exposing said material through a stereoscopic optical device adapted for the production of anaglyphs, and developing said material by means of a color forming developer.

5. A process of producing stereoscopic pictures which comprises incorporating in the upper layer of two silver halide gelatin emulsion layers arranged in superimposition on a support and separated by a yellow filter layer a coupling component having substantive character towards gelatin for the production of a red component picture, sensitizing this layer orthochromatically, incorporating in the lower layer a coupling component having subsantive character towards gelatin for the production of a green component picture, sensitizing this layer panchromatically, exposing said material through a stereoscopic optical device adapted for the production of anaglyphs, developing saidmaterial, treating said developed material with a solution of an antidiazotate, washing the material, treating the material with a slightly acid solution, and removing the silver.

6. A process of producing stereoscopic pictures which comprises incorporating in the upper layerof two silver halide gelatin emulsion layers arranged in superimposition on a support 4.4- diphenyldicarbonylamino-1-phenyl-3- methyl- 5 pyrazolone and a yellow filter dye, sensitizing this layer orthochromatically, incorporating in the lower layer bis-(l-hydroxy-2-naphthoylamino) diphenyl and 2.3-hydroxynaphthoylaminobenzoyl acetanilide, sensitizing this layer panchromatically; exposing said material through a stereoscopic oscopic pictures comprising two silver halide gelatin emulsion layersarranged in superimposition ,on one side of a support, the upper emulsion layer "having incorporated a coupling component having substantive character towards gelatin for the production of a red picture and being orthochromatically sensitized, and the lower emulsion layer 1 having incorporated a coupling component having substantive character towards gelatin for the production of a green picture and being panchromatically sensitized, said lower emulsion layer being protected against the action of--blue light by a yellow filter-layer.

8. A photographic material for producing stere-' scopic pictures comprising two silver halide gelatin emulsion layers arranged in superimposition on one side ofa support, the upper emulsion layer-A having incorporated a coupling component having substantive character towards gelatin for the production of a red picture and being orthochromatically sensitized, and the Ioweremulsion layer having incorporated a coupling component having substantive character towards gelatin for the production of a green picture and being panchromatically sensitized, thetwo emulsion layers being separated by a yellow'fllter layer.

9. A photographic material for producing stereoscopic pictures comprising, two silver halide gelatin emulsion layers arranged in superimposition on one side of a support, the upper emulsion layer having incorporated a yellow filter dyestufi and a coupling component having substantive character towards gelatin for the production of a red picture and being orthochromatically sensitized, and the loweremulsion layer having incorporated a coupling component having substantive character towards gelatin for the production of a green picture and being panchromatically sensitized.

10. A, photographic material for producing stereoscopic pictures comprising two silver halide gelatin emulsion layers arranged in superimposi tion on one side of a support,.the upper. emulsion layer having incorporated a yellow filter dyestui! and $4 diphenyldicarbonylamino-l-plienyl-3- methyl-5-pyrazolone and being orthochromatically sensitized, and the lower emulsion layer bis(1- hydroxy-z-naphthoylamino)diphenyl and 2.3- hydroxynaphthoylaminobenzoyl 'acetanilide- GUSTAV WILMANNS.

SCHNEIDER. 

